NiMH 7.2 Volt Battery

[rwtdiver]

I have used NiMH batteries in my boat before. I prefer NiMH batteries over Lipo's.



This is my new 70 mm WTC which has a pump, main power motor, and three 9g servos. I want to use a 7.2 volt 3600 mAh battery! Could I expect approximately 10 min run times with this battery?

Rob
"Firemen can stand the heat"

[He Who Shall Not Be Named]

I have used NiMH batteries in my boat before. I prefer NiMH batteries over Lipo's.



This is my new 70 mm WTC which has a pump, main power motor, and three 9g servos. I want to use a 7.2 volt 3600 mAh battery! Could I expect approximately 10 min run times with this battery?

Rob
"Firemen can stand the heat"

You won't be high-throttling the thing in a small pool. A few hours, at least. You'll die of boredom before that battery runs flat.

David

[rwtdiver]

You won't be high-throttling the thing in a small pool. A few hours, at least. You'll die of boredom before that battery runs flat.

David

Thanks David,

That was exactly what I wanted to hear! They fit perfectly in the battery compartment, and I feel a little more at ease using NiMH (safer) over Lipo's! :-))

Rob
"Firemen can stand the heat"

[RCSubGuy]

Rob,


You'll want to do some bathtub experiments with the cylinder before committing to the low voltage pack. I'm pretty sure that the pump is designed for 12V. Both the pump and the motor will certainly turn on 7.2V, but won't be at maximum output or efficiency.

I might suggest a 12V NiMh pack with something like a 1800mAh capacity. You'll still get plenty of run time, but the boat will like the higher voltage much better.

Bob

[rwtdiver]

Rob,


You'll want to do some bathtub experiments with the cylinder before committing to the low voltage pack. I'm pretty sure that the pump is designed for 12V. Both the pump and the motor will certainly turn on 7.2V, but won't be at maximum output or efficiency.

I might suggest a 12V NiMh pack with something like a 1800mAh capacity. You'll still get plenty of run time, but the boat will like the higher voltage much better.

Bob

Thanks for the info Bob!

I am just running in our swimming pool so I won't be going anywhere to fast. I like the fact that the 7.2 NiMH battery is a perfect fit for the cylinder as well. If it does not work out, I have an 11.1 volt 3000 mAh lipo battery that I can use as well and it fits in the cylinder as well!

Rob
"Firemen can stand the heat" (it got hot!!)



I also have a confession to make! I smoked the switch! :-(( Dummy me! But I solved that problem by using the switches on the ESC's which works great!! My suggestion is to put up a wiring diagram for both the 70 mm and 80 mm WTC! (For dummies like me) If possible, make one up for the forum.